Nicolas Bentley

Vacationing at a resort hotel in Spain, a man discovers he is the only one not mixed up one way or another in murder, drugs and microfilm smuggling. But, the police are after him!

Two men working on the docks close to London's Tower Bridge find the body of an unidentified man floating in the Thames. The police later identify the body to be that of a diamond courier from Holland. The police have to find his murderer, as well as the missing diamonds he was carrying.